function check_form() {
  var error_message = "Erori::\n";
  var error_found = false;
  var error_field;
  var keywords = document.advanced_search.keywords.value;
  var dfrom = document.advanced_search.dfrom.value;
  var dto = document.advanced_search.dto.value;
  var pfrom = document.advanced_search.pfrom.value;
  var pto = document.advanced_search.pto.value;
  var pfrom_float;
  var pto_float;

  if ( ((keywords == '') || (keywords.length < 1)) && ((dfrom == '') || (dfrom == 'DOB_FORMAT_STRING') || (dfrom.length < 1)) && ((dto == '') || (dto == 'DOB_FORMAT_STRING') || (dto.length < 1)) && ((pfrom == '') || (pfrom.length < 1)) && ((pto == '') || (pto.length < 1)) ) {
    error_message = error_message + " Cel putin un camp din formularul de cautare trebuie accesat.\n";
    error_field = document.advanced_search.keywords;
    error_found = true;
  }

  if ((dfrom.length > 0) && (dfrom != 'DOB_FORMAT_STRING')) {
    if (!IsValidDate(dfrom, 'DOB_FORMAT_STRING')) {
      error_message = error_message + "\t- Invalid de la Data.\n";
      error_field = document.advanced_search.dfrom;
      error_found = true;
    }
  }

  if ((dto.length > 0) && (dto != 'DOB_FORMAT_STRING')) {
    if (!IsValidDate(dto, 'DOB_FORMAT_STRING')) {
      error_message = error_message + "\t- Invalid la Data.\n";
      error_field = document.advanced_search.dto;
      error_found = true;
    }
  }

  if ((dfrom.length > 0) && (dfrom != 'DOB_FORMAT_STRING') && (IsValidDate(dfrom, 'DOB_FORMAT_STRING')) && (dto.length > 0) && (dto != 'DOB_FORMAT_STRING') && (IsValidDate(dto, 'DOB_FORMAT_STRING'))) {
    if (!CheckDateRange(document.advanced_search.dfrom, document.advanced_search.dto)) {
      error_message = error_message + "\t- La Data trebuie sa fie mai mare sau egal cu De La Data. \n";
      error_field = document.advanced_search.dto;
      error_found = true;
    }
  }

  if (pfrom.length > 0) {
    pfrom_float = parseFloat(pfrom);
    if (isNaN(pfrom_float)) {
      error_message = error_message + "\t- Pretul De La trebuie sa fie un numar. \n";
      error_field = document.advanced_search.pfrom;
      error_found = true;
    }
  } else {
    pfrom_float = 0;
  }

  if (pto.length > 0) {
    pto_float = parseFloat(pto);
    if (isNaN(pto_float)) {
      error_message = error_message + "\t- Pretul La trebuie sa fie un numar.\n";
      error_field = document.advanced_search.pto;
      error_found = true;
    }
  } else {
    pto_float = 0;
  }

  if ( (pfrom.length > 0) && (pto.length > 0) ) {
    if ( (!isNaN(pfrom_float)) && (!isNaN(pto_float)) && (pto_float < pfrom_float) ) {
      error_message = error_message + "\t- Pretul La trebuie sa fie mai mare sau egal cu Pretul De La.\n";
      error_field = document.advanced_search.pto;
      error_found = true;
    }
  }

  if (error_found == true) {
    alert(error_message);
    error_field.focus();
    return false;
  } else {
    RemoveFormatString(document.advanced_search.dfrom, "DOB_FORMAT_STRING");
    RemoveFormatString(document.advanced_search.dto, "DOB_FORMAT_STRING");
    return true;
  }
}